$\frac{k}{2k+1}+\frac{1}{\left(2k+1\right)\left(2k+3\right)}$
$\frac{4}{9}b^3-\frac{4\sqrt{7b}}{3}+7$
$\left(4a-b+5c\right)^2$
$8-2x\:si\:x=3$
$7x^2+27x-4=0$
$\left(6m^4+8n^6\right)^3$
$\int\frac{\left(6x-1\right)}{\left(4x^2+4x+10\right)}dx$
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